Molecular Signatures of Glacial Dissolved Organic Matter From Svalbard and Greenland
Glaciers and ice sheets cover over 10 % of Earth's land surface area and store a globally significant amount of dissolved organic matter (DOM), which is highly bioavailable when exported to proglacial environments. Recent rapid glacier mass loss is hypothesized to have increased fluxes of DOM f...
Published in: | Global Biogeochemical Cycles |
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2021
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5006779 2023-05-15T15:10:10+02:00 Molecular Signatures of Glacial Dissolved Organic Matter From Svalbard and Greenland Kellerman, A. Vonk, J. McColaugh, S. Podgorski, D. van Winden, E. Hawkings, J. Johnston, S. Humayun, M. Spencer, R. 2021 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006779 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006779_1/component/file_5006808/5006779.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GB006709 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006779 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006779_1/component/file_5006808/5006779.pdf info:eu-repo/semantics/openAccess Global Biogeochemical Cycles info:eu-repo/semantics/article 2021 ftgfzpotsdam https://doi.org/10.1029/2020GB006709 2022-09-14T05:57:51Z Glaciers and ice sheets cover over 10 % of Earth's land surface area and store a globally significant amount of dissolved organic matter (DOM), which is highly bioavailable when exported to proglacial environments. Recent rapid glacier mass loss is hypothesized to have increased fluxes of DOM from these environments, yet the molecular composition of glacially derived DOM has only been studied for a handful of glaciers. We determine DOM composition using ultrahigh resolution mass spectrometry from a diverse suite of Arctic glacial environments, including time series sampling from an ice sheet catchment in Greenland (Russell Glacier) and outflow from valley glaciers in catchments with varying degrees of glacial cover in Svalbard. Samples from the Greenland outflow time series exhibited a higher degree of similarity than glacier outflow between glaciers in Svalbard; however, supraglacial meltwater samples from Greenland and Svalbard were more similar to each other than corresponding glacial outflow. Outflow from Russell Glacier was enriched in polyphenolic formulae, potentially reflecting upstream inputs from plants and soils, or inputs from paleosols overridden by the ice sheet, whereas Svalbard rivers exhibited a high level of molecular richness and dissimilarity between sites. When comparing DOM compositional analyses from other aquatic systems, aliphatic, and peptide-like formulae appear particularly abundant in supraglacial meltwater, suggesting the DOM quickly metabolized in previous incubations of glacial water originates from energy-rich supraglacial sources. Therefore, as glaciers lose mass across the region, higher-quality fuel for microbial degradation will increase heterotrophy in coastal systems with ramifications for carbon cycling. Article in Journal/Newspaper Arctic glacier glacier Greenland Ice Sheet Svalbard GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Arctic Greenland Svalbard Global Biogeochemical Cycles 35 3 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
description |
Glaciers and ice sheets cover over 10 % of Earth's land surface area and store a globally significant amount of dissolved organic matter (DOM), which is highly bioavailable when exported to proglacial environments. Recent rapid glacier mass loss is hypothesized to have increased fluxes of DOM from these environments, yet the molecular composition of glacially derived DOM has only been studied for a handful of glaciers. We determine DOM composition using ultrahigh resolution mass spectrometry from a diverse suite of Arctic glacial environments, including time series sampling from an ice sheet catchment in Greenland (Russell Glacier) and outflow from valley glaciers in catchments with varying degrees of glacial cover in Svalbard. Samples from the Greenland outflow time series exhibited a higher degree of similarity than glacier outflow between glaciers in Svalbard; however, supraglacial meltwater samples from Greenland and Svalbard were more similar to each other than corresponding glacial outflow. Outflow from Russell Glacier was enriched in polyphenolic formulae, potentially reflecting upstream inputs from plants and soils, or inputs from paleosols overridden by the ice sheet, whereas Svalbard rivers exhibited a high level of molecular richness and dissimilarity between sites. When comparing DOM compositional analyses from other aquatic systems, aliphatic, and peptide-like formulae appear particularly abundant in supraglacial meltwater, suggesting the DOM quickly metabolized in previous incubations of glacial water originates from energy-rich supraglacial sources. Therefore, as glaciers lose mass across the region, higher-quality fuel for microbial degradation will increase heterotrophy in coastal systems with ramifications for carbon cycling. |
format |
Article in Journal/Newspaper |
author |
Kellerman, A. Vonk, J. McColaugh, S. Podgorski, D. van Winden, E. Hawkings, J. Johnston, S. Humayun, M. Spencer, R. |
spellingShingle |
Kellerman, A. Vonk, J. McColaugh, S. Podgorski, D. van Winden, E. Hawkings, J. Johnston, S. Humayun, M. Spencer, R. Molecular Signatures of Glacial Dissolved Organic Matter From Svalbard and Greenland |
author_facet |
Kellerman, A. Vonk, J. McColaugh, S. Podgorski, D. van Winden, E. Hawkings, J. Johnston, S. Humayun, M. Spencer, R. |
author_sort |
Kellerman, A. |
title |
Molecular Signatures of Glacial Dissolved Organic Matter From Svalbard and Greenland |
title_short |
Molecular Signatures of Glacial Dissolved Organic Matter From Svalbard and Greenland |
title_full |
Molecular Signatures of Glacial Dissolved Organic Matter From Svalbard and Greenland |
title_fullStr |
Molecular Signatures of Glacial Dissolved Organic Matter From Svalbard and Greenland |
title_full_unstemmed |
Molecular Signatures of Glacial Dissolved Organic Matter From Svalbard and Greenland |
title_sort |
molecular signatures of glacial dissolved organic matter from svalbard and greenland |
publishDate |
2021 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006779 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006779_1/component/file_5006808/5006779.pdf |
geographic |
Arctic Greenland Svalbard |
geographic_facet |
Arctic Greenland Svalbard |
genre |
Arctic glacier glacier Greenland Ice Sheet Svalbard |
genre_facet |
Arctic glacier glacier Greenland Ice Sheet Svalbard |
op_source |
Global Biogeochemical Cycles |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GB006709 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006779 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006779_1/component/file_5006808/5006779.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2020GB006709 |
container_title |
Global Biogeochemical Cycles |
container_volume |
35 |
container_issue |
3 |
_version_ |
1766341220600119296 |